Relief-valve.



E, v. ANDERSON.

BELIEF VALVE. APPLIIOATION FILED JAN. '1, 1909.

Patented Apr. 27, 1909.

INVENTOH WITNESSES:

construction whereby a certain predetermined pressure the valve ispressure entering through vor discovered certain new closed lower end of the pistori.' The cylinder.

ment in the form of a UNITED STATES PATENT OFFICE.

EDWARD V. ANDERSON, O F MONESS'EN, PENNSYLVANIA, ASSIGNOR, BY DI REACTUAND MESNE ASSIGNMENTS, TO GOLDEN-ANDERSON VALVE SPECIALTY COMPANY, OF PITTSBURG,

PENNSYLVANIA, A CORPORATION OF- PENNSYLVANIA.

RELIEF-VALVE.

To all whom it may concern:

.Be it known that I, EDWARD V. ANDER- soN, residing at Monessen, in the county of Westmoreland and State of Pennsylvan1a, a citizen of the United States, have invented and useful Improvements inRelief-Valves, of which improvements the following isa specification.

The invention described herein relates to certain improvements in relief valves for fluids under pressure, and has for its object a when the fluid attains opened, and when such normal, by reason of the be automatically closed.

pressure returns to escape of fluid,- will The invention is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification, Figure 1 is a sec tional elevation of my improved valve and F 1g. 2 is a transverse section on the plane in-' (heated by the line II-II Fig. 1.

In the practice of m invention the casing -1 is formed with an in ct port 2 and an outlet port 3 referably arrangediat fight angles to each ot er, and is provlded in the up er portion of the casin 'with a cylinder 4 for the reception of the ho cylinder 4 is preferably formed by a lining inserted in the casin and provided with a tubular extension 6 avin 0penings in its sides for the pass e of flui and an o ening in its lower end a apted to be-c'losed y the extension 6 is. provided around its end 0 ening with a seat 7 for the valve formed y the lower end of the piston .5, which also closes the lateralports in the extension. of the As shown the cylinder proper is made of adiameter somewhat eater. than the extension 6 so as to ermit 0 an enlargean e 8, at the upper endof the piston so that the area of the Pieton within the cylinder is greater than the area of its lower end which is subjectedto the the inlet 2.

A fport 9 is formed in the top of the cylinder or the the letter, said port communicating with a Specification of Letters Patent. Application filed January 7', 1909. Serial No.- 471,110.

ow piston-valve 5Q The passage of -fluid into and out of Patented April 27,1909

passage 10, port 11 and main valve. The port 11 is ada ted to be closed by a. valve 13 refer-ably lbrmed by the end of the stem of t e iston 14 arr in a cylinder 15 carried main valve. "The valve 13 to itsseat by a sprin lar. extension 17 of t tension being formed in two sections, one internall threaded and the other externally th-reade to permit of the adjustment of the tension of the spring. The. passage 10 surrounding the va ve 13 is. connected by a port 18 with an axial passage in the valve 13, which in turn is connected by a port 19 with the interior of thecylinder 15 be tpn. This portion of the cbnnected by a by-pass 20 with the inlet port 2, such b ass 1 the walls 0 t e shell 1 and thecap of the sEell asshown. So long as the pressure on t e inlet side of the main valve anali 'or that at which the valve 13 is set,

m the cylinder 15 and thenceb ,gthe port 20, passa e 19 and port 18 intot e passage 10, and t ence by the port 9 into the thus holding the piston valve .5 tightly against its seat. Assoon as the pressure on the inlet side of the main valve is increased beyond normal, the piston 14 will be raised, lifting the valve 13 from its seat and closi the port 18. The fluid'ln the cylinder 4 wi then flow up .through ltheport 9, passage 10, outlet port 11 and paihsa e 12 into the outlet 3 of the main valve, ,so ong asthe pressure on the inlet side'is above normal. As soon as the-esoa e of thefiuid through the outlet port is su cient to relieve the excess lfiressure, the valve 13 by its spring 16 w' be c'losedand fluid will then flow as before described into the cylinder 4,- closing the main valve. I claim herein as my invention: Y

A valve having in combination therewith which in turn is connected by a ythe top of the 1s yieldingly held ow the pis-I i cylinder is also,

is below nor- 16 arranged in a tubu e cylinder 15, such ex- 1 eing preferably formed will flow through the by pass-20' into 9 cylinder 4,

a shell or case for the passage of fluid, avalve controlling such flow an seating against pressure, a cyhnder; a piston arranged in the shell or 0 said cylinder and connected to the w, '2 my \a hermf i have iml'eunnu set passages c0: c'ung the n'det and outie w; mud v r 3, spring 0 oiled movable part or 11. gum i subjected let pressure and connect, d. t0 1 QARNETI, the latter mauve. i EDWAEI M0323. 

